Phy 2

Topics: Skeletal muscle, Myosin, Neuromuscular junction Pages: 4 (861 words) Published: May 15, 2013
Exercise 2: Skeletal Muscle Physiology: Activity 2: The Effect of Stimulus Voltage on Skeletal Muscle Contraction Lab Report Pre-lab Quiz Results You scored 25% by answering 1 out of 4 questions correctly. 1. Skeletal muscle fibers are innervated (stimulated) by You correctly answered: c. motor neurons. 2. A single action potential propagating down a motor axon results in Your answer : a. several action potentials and several contractile events in the muscle fibers it innervates. Correct answer: d. a single action potential and a single contractile event in the muscle fibers it innervates. 3. In resting skeletal muscle, calcium is stored in Your answer : a. the sarcomere. Correct answer: c. the sarcoplasmic reticulum. 4. During the latent period for an isometric contraction Your answer : a. the actin and myosin filaments slide past each other, causing the muscle to shorten. Correct answer: c. the cellular events involved in excitation-contraction coupling occur.


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Experiment Results Predict Question: Predict Question: As the stimulus voltage is increased from 1.0 volt up to 10 volts, what will happen to the amount of active force generated with each stimulus? Your answer : a. The active force will continually increase. Stop & Think Questions: What do you see in the active force display when the stimulus voltage is set to 0.0, and why does this observation make sense? You correctly answered: a. 0.00 g; there was no activation of skeletal muscle fibers by this stimulus. What is the lowest stimulus voltage that induces active force in the skeletal muscle? You correctly answered: b. threshold voltage 6. Enter the threshold voltage for this experiment in the field below and then click Submit to record your answer in the lab report You answered: 0.8 volts 12. Enter the maximal voltage for this experiment in the field below and then click Submit to record your answer in the lab report. You answered: 10 volts Experiment Data: Voltage 0.0 0.2 0.8...
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